ant-design/components/date-picker/style/TimePicker.less

.@{calendar-timepicker-prefix-cls} {
  position: absolute;
  width: 100%;
  top: 34px;
  background-color: #fff;
  height: 206px;

  &-panel {
    z-index: @zindex-picker;
    position: absolute;
    width: 100%;
  }

  &-inner {
    display: inline-block;
    position: relative;
    outline: none;
    list-style: none;
    font-size: 12px;
    text-align: left;
    background-color: #fff;
    background-clip: padding-box;
    line-height: 1.5;
    overflow: hidden;
  }

  &-1-column,
  &-1-column &-select {
    width: 100%;
  }
  &-2-columns &-select {
    width: 115px;
  }
  &-1-column &-select,
  &-2-columns &-select {
    li {
      padding: 0;
      text-align: center;
    }
  }

  &-input-wrap {
    display: none;
  }

  &-select {
    float: left;
    font-size: 12px;
    border: 1px solid @border-color-split;
    border-width: 0 1px;
    margin-left: -1px;
    box-sizing: border-box;
    width: 77px;
    overflow: hidden;
    position: relative; // Fix chrome weird render bug

    &:hover {
      overflow-y: auto;
    }

    &:first-child {
      border-left: 0;
      margin-left: 0;
    }

    &:last-child {
      border-right: 0;
    }

    ul {
      list-style: none;
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      width: 100%;
      max-height: 206px;
    }

    li {
      padding: 0 0 0 28px;
      list-style: none;
      box-sizing: content-box;
      margin: 0;
      width: 100%;
      height: 24px;
      line-height: 24px;
      cursor: pointer;
      user-select: none;
      transition: background 0.3s ease;
    }

    li:last-child:after {
      content: '';
      height: 182px;
      display: block;
    }

    li:hover {
      background: tint(@primary-color, 90%);
    }

    li&-option-selected {
      background: @background-color-base;
      font-weight: bold;
    }

    li&-option-disabled {
      color: @btn-disable-color;
      &:hover {
        background: transparent;
        cursor: not-allowed;
      }
    }
  }
}

.@{calendar-prefix-cls}-time {
  .@{calendar-prefix-cls}-day-select {
    padding: 0 2px;
    font-weight: bold;
    display: inline-block;
    color: #666;
    line-height: 34px;
  }

  .@{calendar-prefix-cls}-footer {
    border-top: 1px solid @border-color-split;
    padding: 10px 0;
    text-align: right;
    position: relative;
    height: auto;
    line-height: auto;

    &-btn {
      line-height: 1.5;
      text-align: right;
    }

    .@{calendar-prefix-cls}-today-btn {
      float: left;
      margin: 0;
      padding-left: 12px;
    }

    .@{calendar-prefix-cls}-time-picker-btn {
      display: inline-block;
      text-align: center;
      margin-right: 60px;

      &-disabled {
        color: #ccc;
      }
    }
  }
}